The Bank of England (BoE) decides monetary policy for the United Kingdom. Its primary goal is to achieve ‘price stability’, or a steady inflation rate of 2%. Its tool for achieving this is via the adjustment of base lending rates. The BoE sets the rate at which it lends to commercial banks and banks lend to each other, determining the level of interest rates in the economy overall. This also impacts the value of the Pound Sterling (GBP).
Quantitative tightening (QT) is the reverse of QE, enacted when the economy is strengthening and inflation starts rising. Whilst in QE the Bank of England (BoE) purchases government and corporate bonds from financial institutions to encourage them to lend; in QT, the BoE stops buying more bonds, and stops reinvesting the principal maturing on the bonds it already holds. It is usually positive for the Pound Sterling.